Radio vacuum tube



Oct. ,2, 1928. 1,685,994

H. M. FREEMAN v RADIO VACUUM TUBE.

Filed Jan. 8, 1924 @Mf BY Cil r-Patexited Oct. 2, 1928.k

g UNITED STATES PA NTL HUBERT M. FREEMAN, for" EAST PTTTsisnnert,` PEnnsYLVANrA; nssrenon'To WEST- 1 i j INGHoUsE Emiccrnrcv a MANUEACTUETnG--oeiarenm e co'EPoRATIon'oF 'PENN-1 y .Application meaJamiary-a, 1924..'j sei-inno; @34,9313 V.

This invention relates to vacuum tube ,devices. l "i V It is an object of this inventionV to produce a non-microphonic tube.

. More specically stated, itisanpbjecto'f the invention to diminish th'e'vibration ofthe standards which carry the, electrodes. 'ln many devices, such vibrations'result"fromlma chanical. jar ofthe tube.

It is an object of my invention'ancillary to the object just mentioned, to. avoid right angle bends in certain of the standards.

Heretofore, these. bends have been deemed necessary 1n order vto vaccommodate the supi-- porting devices which projectA laterally from these standards, This; object Aoft-he invention has been accomplished by ,rearranging the several standards inthe press.; IAnother ob'ect ofmy invention islto provide a systemofstandardsfor supporting the electrodes whichshall be straight ornearly so.' 4If all of the .standardsl were entirely straighnthe partsextending atright angles from some standards would contact with othe/l's. ..'l`his condition is'` avoided in the present invention v,by very slightlybending certain ofthe standards.

It is an ob 'ect of this invention'to reduce the bending ofthe standards to a minimum. An object of this invention,-incidental to the obj ect just mentioned, is to provide a pair of standards which shall engage alongV two elements of theV cylinder constituting the plate, these elements being in a plane at an oblique angle to the plane of the press.

It isA a furtherobject of this invention to so arrange the leads from the standards in theirnew-positions that the external contact pins shall have the same relative positionsl as in the vacuum tubes heretofore used.

In vacuum tubes of this type, as heretofore manufactured, the standard for; supporting f the grid, and the standard for supporting the upper end of the filament are each provided with a right-angle offset close to the press. These offsets are nearly at right angles to the plane of the press, which causes thel 'whole assembly to be bulky and `give the tube a crowded appearance. ing my invention, this appearance is avoided by arranging all of the standards nearly in one plane.

The lstandards for the grid and for` the upper end of the lilament each havesupporting devices extending laterally from them RA-nio'vnctrum TUBE.

In the form embody towardthe center of the i of this type heretofore used, theright-angle. i

bends inthese standards werenecessary'to,

accommodate the supporting devices. Space for these' devices isrobtained by means ofv invention without bending-these standards, by locating `the standards, whichv carry latereV ally exte'ndii'igY devices, at the sidesfof'the press, and the 4other standards bet-Ween them.

ln the prior art, bent`standards"have been placed next to the central standard.- V This change in the relative positions kof the' standards requires, in o rderto accommodate d the new forinofjtube to the standardized fourl terminal pins, that two ofthe leadslfrom the standards cross each other. Accordingly, the lead from the top ofthe `filament isfmade` to pass the lead fromthe'plate in thehollow part of the press.

l'n this invention, the standards which sup' port the plate are the onlystandardsthat are bent. The bend required ,is veryniuch 'less than the right-angle bendsirequiredin the tubes formerly. used. Tubes ofthe former L style have the. plate-supporting standards the sides ofthe press.` The distance between;-

them at thepress is, -therefore,greater than the `diameter of the plate.- Consequentlythe standards in this former style are bentslight-A ly to bring themfto the platef,lhe bends used in the'plate-supporting standards, in

in these standards inthe tubes heretofore used.-

The right-angle bends near the press, the bending of both plate and other standards,`

this invention, are no greater than the bends the' fact that these bends are in different 1 planes, andthe fact that'some o f the oii'sets are large, are all features of the tubes of older Vstyle which are avoided by the presentv invention resulting 1n a very great increase y in convenience in` manufacture.

Other objects vof the invention and detalls of the constructionw'ill be apparent from the following description and the accompanyingV drawings in which Fig. 2 is a side View of the same with a, diagrammatic indication' of the connections to the contact pins, and Y Fig." 3 is a view taken at right angles to thatoflcligzQ.` n

The press lis of the usual form, including a hollow part 2 and a flattened portion which lood Vligure l is a top plan view of the electrodes l and press,

Vsecures tli'estandards in place.' The central f standard 3 isattaehed to the lowerend. of ther `filament/1 b the usual connector. The upper .The standard 6 V*occupies the rghtehand I v; position in fthe-press, as shown inl Figs. 1

and' 2. `The standard 7, at theleft--harid side 1010f the pre supports the grid 8 b means ...artesana n Mfwelded mais Standeraa'nd extending,

, Y ,er futili i n with late 11vr is supported by two' standards` l ofrwhichis bent slightly Where vit eitfgesfrom the press and is bent a second time; as shown at 14 and 15 in Fig. 3, to make tlievu r'portions of the standards parallel.

lein a l'plane making an angle of lgtdegfrees'fwith theplane ofthe press. `gives ample'room for thelower arm 9 id Without danger of its cont eplate standard 13. c of the'standards, except 13, pass f fthe flattened part of the press into n er part thereof, and constitute leads, Wlii l "o to the exterior. contact pins, by

y 4whieh, t ve tube is connected to the apparatus with it isused. In order that this tube K usedwiththe same apparatus as tubes .oftliis tpe heretofore in use, the several V'eleetrod .must befconnected to contact pins located in the same relative positions asv in *tliefpld devices.A lInorder to accomplish this "fshlqtm leadsfrom standardsv 6` and 12 @generierte-ryan an angle, as Shown at k17 11`FigJ2; y Itis, of `course,understood that flese'gcrossing leads are t'in the same plane dithat, therefore, there is lno likelihood of p pllel portions as best shown in* f6. Fig. 1,

Contact Vbetween them. The pin V18,1vvhich is connected to the plate,` is of larger size than the thre'eother contact pins in order to pre Various modilicatzionsofi the i .invention Will' be apparent to' those skilled in the art,and I do not, therefore, intend that the single specific v.iffor'm illustrated shall-be interpreted' as a limitation. No limitations except those'neces'sitatedby the'p'rior art'or indicated in intended. Y Y

y I claim as my invention:y L

1. In afvac'uumtube devic'e, a press, a cylinr drical plate, tvvo standards mounted infsaid press and secured to said plate alongelements of the cylinder, the plane' of saidfelements vbeing at an oblique anglefto'V the plane of said press.

a vacuum tube device, a press, a cylin'- x M 2. In drical plate, t-Wo standards mounted linf'said press and secured to said plate along elements ofy the cylinder, the plane of vsaid elements* being at an oblique angle tothe plane of 'said press and each of said standards having two bends between thep'late andthe press.

3. Ina Vacuum tube device, a press,a-'c'yli'i'i-` drical plate,two standards Iifioln'ited in'saiclm press and secured'to said platealon'g elements of the cylinder, the plane of said elements being at an oblique angle to v the plane of said the accompanying claims *are y press and each of said standards'havi'ng Vtwo bends between the'plate and the press, each ofrsaid bends being less than 45 degres'sff7 In testimony whereof, I have hereunto' sub'- scribed my name this 17th'day of December, 1923. l

v HUBEirr FREEMAN. i n 

